An alkaline earth metal $(M)$ gives a salt with chlorine,which is insoluble in water at room temperature but soluble in boiling water. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called 'lithopone' - a white pigment. Metal $M$ is

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Barium carbonate is insoluble in water and is highly stable.
Reason $R$: The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below for $A$ and $R$.

Give a brief note on the oxides of alkaline earth metal elements.

Why does the solubility of alkaline earth metal hydroxides in water increase down the group?

Which colour is developed in the solution when alkaline earth metals are dissolved in liquid ammonia?

Which of the following oxides is most acidic in nature?